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PDF AT49F020 Data sheet ( Hoja de datos )
| Número de pieza | AT49F020 | |
| Descripción | 2-Megabit 5-volt Only Flash Memory | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Single Voltage Operation
– 5V Read
– 5V Reprogramming
• Fast Read Access Time - 90 ns
• Internal Program Control and Timer
• 8K Bytes Boot Block With Lockout
• Fast Erase Cycle Time - 10 seconds
• Byte-By-Byte Programming - 50 µs/Byte
• Hardware Data Protection
• DATA Polling For End Of Program Detection
• Low Power Dissipation
– 50 mA Active Current
– 100 µA CMOS Standby Current
• Typical 10,000 Write Cycles
Description
The AT49F020 is a 5-volt only in-system Flash Memory. Its 2 megabits of memory is
organized as 262,144 words by 8 bits. Manufactured with Atmel’s advanced nonvola-
tile CMOS technology, the device offers access times to 90 ns with power dissipation
of just 275 mW over the commercial temperature range. When the device is dese-
lected, the CMOS standby current is less than 100 µA.
To allow for simple in-system reprogrammability, the AT49F020 does not require high
input voltages for programming. Five-volt-only commands determine the read and
programming operation of the device. Reading data out of the device is similar to
reading from an EPROM. Reprogramming the AT49F020 is performed by erasing the
entire 2 megabits of memory and then programming on a byte by byte basis. The byte
Pin Configurations
(continued)
PLCC Top View
Pin Name
Function
A0 - A17
CE
OE
WE
I/O0 - I/O7
NC
Addresses
Chip Enable
Output Enable
Write Enable
Data Inputs/Outputs
No Connect
A7 5
A6 6
A5 7
A4 8
A3 9
A2 10
A1 11
A0 12
I/O0 13
29 A14
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 I/O7
2-Megabit
(256K x 8)
5-volt Only
Flash Memory
AT49F020
TSOP Top View
Type 1
A11
A9
A8
A13
A14
A17
WE
VCC
NC
A16
A15
A12
A7
A6
A5
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32 OE
31 A10
30 CE
29 I/O7
28 I/O6
27 I/O5
26 I/O4
25 I/O3
24 GND
23 I/O2
22 I/O1
21 I/O0
20 A0
19 A1
18 A2
17 A3
DIP Top View
NC
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32 VCC
31 WE
30 A17
29 A14
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 I/O7
20 I/O6
19 I/O5
18 I/O4
17 I/O3
Rev. 0567C–10/98
1
1 page  
AT49F020
AC Read Characteristics
Symbol
tACC
tCE(1)
tOE(2)
tDF(3)(4)
tOH
Parameter
Address to Output Delay
CE to Output Delay
OE to Output Delay
CE or OE to Output Float
Output Hold from OE, CE or
Address, whichever occurred first
AC Read Waveforms(1)(2)(3)(4)
AT49F020-90
Min Max
90
90
0 40
0 25
0
AT49F020-12
Min Max
120
120
0 50
0 30
0
AT49F020-15
Min Max
150
150
0 70
0 40
0
Units
ns
ns
ns
ns
ns
Notes: 1. CE may be delayed up to tACC - tCE after the address transition without impact on tACC.
2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE or by tACC - tOE after an address change
without impact on tACC.
3. tDF is specified from OE or CE whichever occurs first (CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
Input Test Waveforms and
Measurement Level
Output Test Load
tR, tF < 5 ns
Pin Capacitance
f = 1 MHz, T = 25°C(1)
Symbol
Typ
Max
CIN
COUT
Note:
46
8 12
1. This parameter is characterized and is not 100% tested.
Units
pF
pF
Conditions
VIN = 0V
VOUT = 0V
5
5 Page 
Packaging Information
32J, 32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
Dimensions in Inches and (Millimeters)
JEDEC OUTLINE MS-016 AE
.045(1.14) X 45˚ PIN NO. 1
IDENTIFY
.025(.635) X 30˚ - 45˚
.012(.305)
.008(.203)
.032(.813)
.026(.660)
.553(14.0)
.547(13.9)
.595(15.1)
.585(14.9)
.530(13.5)
.490(12.4)
.021(.533)
.013(.330)
.050(1.27) TYP
.300(7.62) REF
.430(10.9)
.390(9.90)
AT CONTACT
POINTS
.030(.762)
.015(.381)
.095(2.41)
.060(1.52)
.140(3.56)
.120(3.05)
.453(11.5)
.447(11.4)
.495(12.6)
.485(12.3)
.022(.559) X 45˚ MAX (3X)
32T, 32-Lead, Plastic Thin Small Outline Package
(TSOP)
Dimensions in Millimeters and (Inches)*
JEDEC OUTLINE MO-142 BD
INDEX
MARK
18.5(.728) 20.2(.795)
18.3(.720) 19.8(.780)
AT49F020
32P6, 32-Lead, 0.600" Wide, Plastic Dual Inline
Package (PDIP)
Dimensions in Inches and (Millimeters)
1.67(42.4)
1.64(41.7)
PIN
1
.566(14.4)
.530(13.5)
.220(5.59)
MAX
SEATING
PLANE
.161(4.09)
.125(3.18)
.110(2.79)
.090(2.29)
.012(.305)
.008(.203)
1.500(38.10) REF
.090(2.29)
MAX
.005(.127)
MIN
.065(1.65)
.041(1.04)
.065(1.65)
.015(.381)
.022(.559)
.014(.356)
.630(16.0)
.590(15.0)
0 REF
15
.690(17.5)
.610(15.5)
0.50(.020)
BSC
7.50(.295)
REF
8.20(.323)
7.80(.307)
0.25(.010)
0.15(.006)
1.20(.047) MAX
0
5
REF
0.15(.006)
0.05(.002)
0.70(.028)
0.50(.020)
*Controlling dimension: millimeters
0.20(.008)
0.10(.004)
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AT49F020.PDF ] | |
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